针对海洋环境对抗动态磨损涂层兼备耐腐蚀的需求，本项目提出了梯度素涂层概念。“素”指单相；“梯度”指涂层结构、模量和应力梯度。单相避免多元素造成的电化学腐蚀。梯度素涂层中，高模量/应力的超致密层阻止腐蚀介质到达涂层与基体界面，涂层耐蚀/抗磨，易脆裂；低模量/应力的疏松层吸收外力并阻碍应力扩展。腐蚀耦合动态载荷作用下，梯度素涂层及基体发生协同变形，抑制致密层开裂及涂层脱落。热丝增强等离子体磁控溅射技术能自由调控等离子体密度，作为获得梯度素涂层的手段。项目拟通过模拟计算动态载荷下梯度素涂层中应力场分布、探测微/纳尺度下应力-变形演化过程，研究载荷能量在梯度素涂层中的传导、张应力生成和协同变形临界条件，设计素涂层梯度；探讨等离子体离子密度和能量对素涂层梯度的调控机制；通过评价梯度素涂层的结构、应力及性能，阐述腐蚀耦合动态载荷下梯度素涂层对抗动态磨损耦合腐蚀失效的抑制作用和机制。

The concept of ‘single phase gradient nitride coating’ is proposed in this project in order to provide the anti-abrasion and anti-corrosion performance, whilst the coating is suffered circular friction or impact load in the marine environment. The high modulus, high stress and ultra-dense layers of the structure gradient coating block the corrosive medium pass through into the boundary between coating and substrate，i.e. the corrosion-resistant gradient coating with anti-abrasion capacity, but brittle; the low modulus, low stress and loose layers absorb the energy and prevent the stress expansion. The coordination deformation within the gradient coating and between the coating and substrate inhibits the delamination failure of the coating and the cracks of the dense layers, under the circular friction or impact load in the marine environment. The hot-wire enhanced plasma magnetron sputtering, due to the free adjustment of plasma density, guarantees technically the preparation of the gradient coating. The objects of this project are: to investigate the mechanisms of the generation of the inner-stress and the coordination deformation related to the energy transformation through numerical simulation of the stress distribution within the coatings and experimental measurement of the stress-strain curves in micro/nano scales, to design the coating’s gradients according to; to discuss the relationship between the ions’ densities and energies in plasma and the gradient structure, modulus and stress of the coating; to state the mechanisms to inhibit the coupling failure of the abrasion and corrosion of the gradient coatings under the circular friction or impact loads in the marine environment by evaluation of the structure, stress and performance of the gradient coatings.